The Muslim Brotherhood has warned that Egypt's fragile democratic gains are under threat, after a surprise court ruling overturned last year's parliamentary elections. Egypt could see "dangerous" days ahead if power is returned to those linked to the previous regime, the group said.

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The group's candidate, Mohammed Mursi, faces former prime minister Ahmed Shafiq in a runoff presidential election this weekend. The decision by the Supreme Court to disband parliament on Thursday plunged Egypt into turmoil.

The World's Matthew Bell reports on the mood in Cairo as Egyptians prepare to vote in a presidential run-off election this weekend.